To produce sound people use their organ of speech and this process consists of a number of the successive steps. First of all the air stream realized by the lungs does through the windpipe and comes to the larynx, which contains the vocal cords. The vocal cords are two elastic folds (opening between them is called the glottis) which are either brought together and vibrate (in this case we hear vowels or voiced consonants) or kept apart (in this case there is no vibration and the voice is not heard).
On coming out of the larynx the air stream passes through the pharynx. It cavity extends from the top of the larynx to the soft palate, which directs the air stream either to the mouth or nasal cavities, such functions as the principal resonators. The soft palate can easily move. When the soft palate is in it’s the lowered position the air goes up into the nasal cavity and them out through the nose. When the soft palate is raised the uvula (the end of the soft palate) forms a full contact with back wall of the pharynx and the air stream goes through the mouth cavity. The soft palate is the furthest part of the palate from the teeth. Most of the palate is hard, and it’s divided into the hard palate and the teeth ridge or alveolar ridge (the part immediately behind the upper front teeth).
The most important organ of speech is the tongue. Phoneticians divide the tongue into 4 sections: 1) the back of the tongue; 2) the front part facing of the tongue; 3) the blade (it lies under the teeth ridge); 4) the tip. The tongue may lie flat or move in the horizontal or vertical direction. It can also change it’s shape. So that the sides are curved up forming a groove. The lips can take up various positions as well. They can be neutral, rounded or protruded forward.
All the organs of speech can be divided into 2 groups:
1. Active organs of speech, they are movable and take an active part in the sound formation. They are tongue,